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Questions - drawimage

Javascript's function drawImage() needs the page to reload to work

I have a problem with the javascript function drawImage(). It needs the page to reload to work. My code: <canvas id="canva" width="350px" height="350px" style="op...
test-img

hippopankutz

javascript

html

drawimage

Votes: 0

Answers: 1

Latest Answer

Try monImage.onload = action instead of monImage.onload = action()
test-img

AnthonyDev220

Remove image background with HTML Canvas given the alpha matte

How to remove the background of an image using HTML Canvas, given an alpha matte as a matrix? More context about the problem: Alpha matte is a matrix of floats between 0 and 1, inclusive. It correspo...
test-img

Imran Kocabiyik

html5-canvas

drawimage

Votes: 0

Answers: 1

Latest Answer

See the MDN canvas documentation.. It is the same principle, here you want to change the alpha channel of the pixels so you may have something that look like this : ctx.drawImage(img, 0, 0); const ima...
test-img

Lukas Laudrain

Node.js Application, leveraging JSDOM and node-canvas, trying to drawImage from one canvas to another

I have a code snippet, where I'm leveraging two canvases... One is generated in an emulated DOM, using JSDOM... and the other is directly using NPM-Canvas I am using heatmap.js to create an image in t...
test-img

Justin Young

canvas

jsdom

drawimage

Votes: 0

Answers: 1

Latest Answer

In the code - the line/function myCtx.drawImage(htmap, 0, 0); htmap should be called with canvas or image. Currently it is an instance of HTMLCanvasElement. you may use heatmapInstance.getDataURL(); t...
test-img

Shriram Jadhav

HTML 5 wait for drawImage to finish in a Vue SPA

I have been trying to debug something for a week and I now suspect the problem is that the drawImage function does not have time to finish. I have a for loop that composes a canvas element by stitchin...
test-img

Curious

html

vue.js

canvas

drawimage

Votes: 0

Answers: 1

Latest Answer

I managed to get it working by properly wrapping the drawImage step in a separate method and inside a promise the proper way. See the code below for an example of two methods that were the culprits bu...
test-img

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